US6690768B2 - Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling - Google Patents
Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling Download PDFInfo
- Publication number
- US6690768B2 US6690768B2 US09/745,938 US74593800A US6690768B2 US 6690768 B2 US6690768 B2 US 6690768B2 US 74593800 A US74593800 A US 74593800A US 6690768 B2 US6690768 B2 US 6690768B2
- Authority
- US
- United States
- Prior art keywords
- data
- power level
- response
- dsl
- dtmf
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2618—Reduction thereof using auxiliary subcarriers
Definitions
- the invention relates to digital subscriber line (DSL) transceivers. More particularly, the invention relates to power cutback configuration of DSL transceivers using public switched telephone network (PSTN) signaling.
- PSTN public switched telephone network
- DSL provides a subscriber with the ability to use a twisted-pair telephone line for both voice and data simultaneously.
- the frequency ranges supported by the twisted-pair line are divided into three or more bands and used for specific purposes. For example, 0-4 kHz can be used for voice communication, 30-138 kHz can be used for upstream data communications and 138+kHz can be used for downstream data communications.
- Upstream communications refers to data flow from the DSL modem to a service provider, while downstream communications refers to data flow from the service provider to the DSL modem.
- Other DSL standards also exist that use different frequency allocations.
- the power levels at which DSL modems transmit upstream data must be carefully controlled so that the modem signals do not interfere with the voice communications over the twisted-pair line.
- Current power level configurations include providing a predetermined power cutback (e.g., 80%) for all applications of a particular modem model. These cutback levels are typically selected based on a worst case scenario basis. Providing a predetermined power cutback level for all DSL modems results in most modems operating at less than peak efficiency.
- Power cutback is typically provided by one or more filters and/or gain control units.
- the modem can include a bandpass filter that passes frequencies used for upstream communications and limit the upstream power to a fixed predetermined power level.
- filters reduce flexibility because filters provided by a manufacturer are typically designed based on worst case scenarios. Flexibility may be provided by allowing a modem user or technician to change the filter power output, but this would require the user or technician to access the internal components of the modem, which may result in reduced efficiency or lifespan of the modem.
- FIG. 1 is a block diagram of a subscriber location having multiple telephones and a DSL modem coupled to a digital subscriber line access multiplexer (DSLAM).
- DSL modem coupled to a digital subscriber line access multiplexer (DSLAM).
- DSL modem coupled to a digital subscriber line access multiplexer (DSLAM).
- DSL modem coupled to a digital subscriber line access multiplexer (DSLAM).
- DSL modem digital subscriber line access multiplexer
- FIG. 2 is a block diagram of a DSL modem in which the power cutback of the DSL transceiver can be controlled using PSTN signaling.
- FIG. 3 is a flow diagram of a technique for power cutback of a DSL transceiver using PSTN signaling.
- DSL digital subscriber line
- the invention provides a technique for power cutback of DSL transceivers (e.g., modems) using public switched telephone network (PSTN) signaling.
- DSL transceivers e.g., modems
- PSTN public switched telephone network
- DSL transceivers e.g., modems
- DTMF dual-tone/multiple frequency
- a user of a DSL modem can cause the modem to transmit upstream data while listening to the microphone of a telephone coupled to the same twisted-pair line as the DSL transceiver.
- Data transmission power can be adjusted by use of one or more buttons on the telephone.
- the DSL transceiver in response to one or more predetermined DTMF signals, can adjust transmission power.
- the power cutback of the DSL transceiver can be controlled using PSTN signaling.
- FIG. 1 is a block diagram of a subscriber location having multiple telephones and a DSL modem coupled to a digital subscriber line access multiplexer (DSLAM).
- Subscriber location 100 can be, for example, a residence, a business, or any location having both telephone access and network access over twisted-pair line 150 .
- Within subscriber location telephones 110 and 120 are coupled to twisted-pair line 150 .
- DSL modem 130 is also coupled to twisted-pair line 150 .
- DSLAM 170 is coupled to twisted-pair line 150 .
- DSLAM 170 is also coupled to other twisted-pair lines (not shown in FIG. 1 ).
- DSLAM 170 separates the voice frequency signals from the high-speed data traffic and controls and routes DSL traffic between end user equipment (e.g., router, modem, network interface card) and network 180 .
- Network 180 can be any type of network, for example, the Internet or a service provider's network.
- upstream communications are in the range of 16 kbps and 640 kbps.
- Downstream communications are typically in the range of 1.5 Mbps and 9 Mbps. However, any communication speeds can be supported.
- FIG. 2 is a block diagram of a DSL modem in which the power cutback of the DSL transceiver can be controlled using PSTN signaling.
- the data When data is transmitted, the data is received by modulator/demodulator 230 and modulated in any manner known in the art.
- the level of the output signal is controlled by power control circuitry 220 .
- the modulated data is passed through high-pass filter 200 to twisted-pair line 150 .
- High-pass filter 200 filters out low frequency harmonics that could interfere with voice communications.
- power control circuitry 220 can also control high-pass filter 200 .
- modulated data is carried over twisted-pair line 150 to high-pass filter 200 .
- High-pass filter 200 filters out low frequency voice communications and passes high frequency data communications to modulator/demodulator 230 .
- the data is demodulated by modulator/demodulator 230 in any manner known in the art.
- DTMF signal detector 210 is coupled to twisted-pair line 150 and detects DTMF signals on twisted-pair line 150 .
- DTMF signal detector 210 can detect one or more DTMF signals in any manner known in the art.
- Power control circuitry 220 determines the power level at which modulator/demodulator 230 transmits data.
- power control circuitry 220 and/or DTMF signal detector 210 are physically separate from DSL modem 130 .
- DSL modem 130 can have a port for power cutback purposes that allows a user or technician to temporarily couple power control circuitry 220 and DTMF signal detector 210 between twisted-pair line 150 and DSL modem 130 for power cutback configuration purposes.
- DTMF signal detector 210 generates a first signal in response to a predetermined DTMF signal detected on twisted-pair line 150 . In an alternate embodiment, DTMF signal detector 210 generates multiple signals in response to one or more DTMF signals detected on twisted-pair line 150 . DTMF signal detector 210 can generate the one or more signals in any manner known in the art.
- DSL modem 130 While the components of DSL modem 130 are described with respect to DTMF signals, other types of telephone-generated signals can be used in a similar manner to control power cutback of a DSL transceiver.
- Power control circuitry 220 are coupled to receive the one or more signals from DTMF signal detector 210 . Power control circuitry 220 generates one or more signals that are received by modulator/demodulator 230 . In one embodiment, the one or more signals generated by power control circuitry 220 cause modulator/demodulator 230 to modify the power at which upstream data is transmitted. This can be either an analog or digital interface. In an alternate embodiment, the one or more signals generated by power control circuitry 220 control a filter within modulator/demodulator 230 or high-pass filter 200 directly. Other techniques for controlling upstream data transmission power levels can also be used.
- FIG. 3 is a flow diagram of a technique for power cutback of a DSL transceiver using PSTN signaling.
- the flow diagram of FIG. 3 refers only to reduction of power by the DSL transceiver.
- An increase in transmission power by the DSL transceiver can be accomplished in a similar manner.
- Data is transmitted upstream with the DSL transceiver at 310 .
- a power cutback file having data to be transmitted for a predetermined length of time can be provided.
- a file can be transferred to a service provider. Any type of data can be transferred up stream in any manner for purposes of determining the desired power cutback for the DSL transceiver.
- a person configuring the power cutback of the DSL transceiver listens to a speaker of a telephone coupled to the same twisted-pair line as the DSL transceiver that is transmitting data. The person listens for noise or other interference that is caused by the DSL transceiver. Because different people have different tolerances for interference with voice communications, the power level at which interference occurs may be different for different people. Also, different telephones can cause different noise levels.
- a user that is configuring the DSL transceiver can call a customer service or other telephone number. During the telephone call the user or a customer service representative can cause the DSL transceiver to transmit data upstream. When the DSL transceiver is transmitting the data, the user or the customer service representative can configure the power cutback by using DTMF signaling while the user is listening for noise on the line.
- the power level of the data transmission does not interfere with voice communications and the power level used by the DSL transceiver is acceptable. If audible noise is detected at 330 , the user presses a predetermined key (e.g., 5 ) on the keypad of the telephone that is being used. The DTMF signal generated by pressing the key is received by the DSL modem and causes the DSL modem to transmit at a reduced power level. In one embodiment, the user repeatedly presses the key until no audible noise is detected.
- a predetermined key e.g., 5
- DSL transceiver software includes a “wizard” that guides a user through the steps of configuring the DSL modem including power cutback as described above.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/745,938 US6690768B2 (en) | 2000-12-21 | 2000-12-21 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
AT01272455T ATE342630T1 (de) | 2000-12-21 | 2001-11-19 | Leistungszurückschaltungskonfiguration eines digitalen teilnehmerleitungssendempfängers unter verwendung einer signalisierung des öffentlichen telefonnetzes |
DE60123834T DE60123834T2 (de) | 2000-12-21 | 2001-11-19 | Leistungszurückschaltungskonfiguration eines digitalen teilnehmerleitungssendempfängers unter verwendung einer signalisierung des öffentlichen telefonnetzes |
CA002432935A CA2432935C (en) | 2000-12-21 | 2001-11-19 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
CNB018226221A CN100539625C (zh) | 2000-12-21 | 2001-11-19 | 使用公用交换电话网的数字用户线的功率缩减配置 |
EP01272455A EP1350382B1 (de) | 2000-12-21 | 2001-11-19 | Leistungszurückschaltungskonfiguration eines digitalen teilnehmerleitungssendempfängers unter verwendung einer signalisierung des öffentlichen telefonnetzes |
AU2002217828A AU2002217828A1 (en) | 2000-12-21 | 2001-11-19 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
PCT/US2001/043923 WO2002052805A2 (en) | 2000-12-21 | 2001-11-19 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
HK04100806A HK1058117A1 (en) | 2000-12-21 | 2004-02-06 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/745,938 US6690768B2 (en) | 2000-12-21 | 2000-12-21 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020080933A1 US20020080933A1 (en) | 2002-06-27 |
US6690768B2 true US6690768B2 (en) | 2004-02-10 |
Family
ID=24998871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/745,938 Expired - Fee Related US6690768B2 (en) | 2000-12-21 | 2000-12-21 | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling |
Country Status (9)
Country | Link |
---|---|
US (1) | US6690768B2 (de) |
EP (1) | EP1350382B1 (de) |
CN (1) | CN100539625C (de) |
AT (1) | ATE342630T1 (de) |
AU (1) | AU2002217828A1 (de) |
CA (1) | CA2432935C (de) |
DE (1) | DE60123834T2 (de) |
HK (1) | HK1058117A1 (de) |
WO (1) | WO2002052805A2 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020003871A1 (en) * | 2000-03-31 | 2002-01-10 | Fred Stacey | System and method for synchronizing sample rates of voiceband channels and a DSL interface channel |
US20020072386A1 (en) * | 2000-07-28 | 2002-06-13 | Alberto Ginesi | Apparatus and method of loop and rate dependent power cutback |
US20040121726A1 (en) * | 2002-12-18 | 2004-06-24 | Bifano Louis D. | Telecommunications network employing a wireless backup path |
US20040119457A1 (en) * | 2002-12-23 | 2004-06-24 | Prashant Singh | Peripheral device receiver detection in a high noise environment |
US20080212614A1 (en) * | 2005-03-10 | 2008-09-04 | Huawei Technologies Co., Ltd. | Method and system for extending transmission distance of adsl signal |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1689276A (zh) * | 2002-04-01 | 2005-10-26 | 斯科特·D·莫多克 | 组合收费电话和无线接入技术的数据通信系统 |
US7738511B2 (en) * | 2003-07-11 | 2010-06-15 | Hubbell Incorporated | Apparatus and method for transmitting a DS3 signal over multiple twisted pair conductors |
CN101166046B (zh) * | 2006-10-19 | 2011-07-20 | 中兴通讯股份有限公司 | 一种数字用户线dsl功率控制方法及其控制系统 |
CN101399755B (zh) * | 2007-09-27 | 2011-08-10 | 中兴通讯股份有限公司 | 一种dsl设备动态策略控制的方法 |
CN103701739B (zh) * | 2013-12-23 | 2017-02-08 | 北京航天测控技术有限公司 | 矢量调制信号处理方法及装置 |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6482751A (en) * | 1987-09-24 | 1989-03-28 | Nec Corp | Communication network control system |
JPH02192254A (ja) * | 1989-01-19 | 1990-07-30 | Fujitsu Ltd | 音声品質選択機能付電話機 |
JPH08251276A (ja) | 1995-03-14 | 1996-09-27 | Sharp Corp | 電話機 |
US5761649A (en) * | 1992-04-10 | 1998-06-02 | Charles E. Hill & Associates, Inc. | Method for updating a remote computer |
US6014425A (en) * | 1997-02-26 | 2000-01-11 | Paradyne Corporation | Apparatus and method for qualifying telephones and other attached equipment for optimum DSL operation |
US6061427A (en) * | 1997-08-30 | 2000-05-09 | Samsung Electronics Co., Ltd. | Transmission power control method in asymmetric digital subscriber line system |
WO2000052920A1 (en) | 1999-03-01 | 2000-09-08 | Ericsson, Inc. | Splitter-less digital subscriber loop modem |
US6192109B1 (en) * | 1997-12-24 | 2001-02-20 | Globespan, Inc. | Apparatus and method for improved DSL communication |
US6226356B1 (en) * | 1998-06-12 | 2001-05-01 | Legerity Inc. | Method and apparatus for power regulation of digital data transmission |
US6236714B1 (en) * | 1999-07-07 | 2001-05-22 | Centillium Communications, Inc. | Transmit power control for DSL modems in splitterless environment |
US6418196B1 (en) * | 1997-10-06 | 2002-07-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system in telecommunications system |
US6426961B1 (en) * | 1998-09-02 | 2002-07-30 | Bellsouth Intellectual Property Corporation | Method and system for selection of mode of operation of a service in light of use of another service in an ADSL system |
US6532277B2 (en) * | 1999-11-12 | 2003-03-11 | Qwest Communications International Inc. | Method for controlling DSL transmission power |
US6542581B2 (en) * | 2001-02-09 | 2003-04-01 | Vdsl Systems | Method for controlling the transmission power in a digital subscriber line |
-
2000
- 2000-12-21 US US09/745,938 patent/US6690768B2/en not_active Expired - Fee Related
-
2001
- 2001-11-19 AT AT01272455T patent/ATE342630T1/de not_active IP Right Cessation
- 2001-11-19 AU AU2002217828A patent/AU2002217828A1/en not_active Abandoned
- 2001-11-19 EP EP01272455A patent/EP1350382B1/de not_active Expired - Lifetime
- 2001-11-19 CN CNB018226221A patent/CN100539625C/zh not_active Expired - Fee Related
- 2001-11-19 CA CA002432935A patent/CA2432935C/en not_active Expired - Fee Related
- 2001-11-19 WO PCT/US2001/043923 patent/WO2002052805A2/en active IP Right Grant
- 2001-11-19 DE DE60123834T patent/DE60123834T2/de not_active Expired - Lifetime
-
2004
- 2004-02-06 HK HK04100806A patent/HK1058117A1/xx not_active IP Right Cessation
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6482751A (en) * | 1987-09-24 | 1989-03-28 | Nec Corp | Communication network control system |
JPH02192254A (ja) * | 1989-01-19 | 1990-07-30 | Fujitsu Ltd | 音声品質選択機能付電話機 |
US5761649A (en) * | 1992-04-10 | 1998-06-02 | Charles E. Hill & Associates, Inc. | Method for updating a remote computer |
JPH08251276A (ja) | 1995-03-14 | 1996-09-27 | Sharp Corp | 電話機 |
US6014425A (en) * | 1997-02-26 | 2000-01-11 | Paradyne Corporation | Apparatus and method for qualifying telephones and other attached equipment for optimum DSL operation |
US6061427A (en) * | 1997-08-30 | 2000-05-09 | Samsung Electronics Co., Ltd. | Transmission power control method in asymmetric digital subscriber line system |
US6418196B1 (en) * | 1997-10-06 | 2002-07-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system in telecommunications system |
US6192109B1 (en) * | 1997-12-24 | 2001-02-20 | Globespan, Inc. | Apparatus and method for improved DSL communication |
US6226356B1 (en) * | 1998-06-12 | 2001-05-01 | Legerity Inc. | Method and apparatus for power regulation of digital data transmission |
US6426961B1 (en) * | 1998-09-02 | 2002-07-30 | Bellsouth Intellectual Property Corporation | Method and system for selection of mode of operation of a service in light of use of another service in an ADSL system |
WO2000052920A1 (en) | 1999-03-01 | 2000-09-08 | Ericsson, Inc. | Splitter-less digital subscriber loop modem |
US6236714B1 (en) * | 1999-07-07 | 2001-05-22 | Centillium Communications, Inc. | Transmit power control for DSL modems in splitterless environment |
US6532277B2 (en) * | 1999-11-12 | 2003-03-11 | Qwest Communications International Inc. | Method for controlling DSL transmission power |
US6542581B2 (en) * | 2001-02-09 | 2003-04-01 | Vdsl Systems | Method for controlling the transmission power in a digital subscriber line |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020003871A1 (en) * | 2000-03-31 | 2002-01-10 | Fred Stacey | System and method for synchronizing sample rates of voiceband channels and a DSL interface channel |
US7221703B2 (en) * | 2000-03-31 | 2007-05-22 | Ciena Corporation | System and method for synchronizing sample rates of voiceband channels and a DSL interface channel |
US20020072386A1 (en) * | 2000-07-28 | 2002-06-13 | Alberto Ginesi | Apparatus and method of loop and rate dependent power cutback |
US7536197B2 (en) * | 2000-07-28 | 2009-05-19 | Ciena Corporation | Apparatus and method of loop and rate dependent power cutback |
US20040121726A1 (en) * | 2002-12-18 | 2004-06-24 | Bifano Louis D. | Telecommunications network employing a wireless backup path |
US7356348B2 (en) * | 2002-12-18 | 2008-04-08 | General Instrument Corporation | Method and apparatus for providing telecommunications over a cable network employing a wireless communication path as an alternative backup path |
US20040119457A1 (en) * | 2002-12-23 | 2004-06-24 | Prashant Singh | Peripheral device receiver detection in a high noise environment |
US7190714B2 (en) * | 2002-12-23 | 2007-03-13 | Lsi Logic Corporation | Peripheral device receiver detection in a high noise environment |
US20080212614A1 (en) * | 2005-03-10 | 2008-09-04 | Huawei Technologies Co., Ltd. | Method and system for extending transmission distance of adsl signal |
US8385509B2 (en) | 2005-03-10 | 2013-02-26 | Huawei Technologies Co., Ltd. | Method and system for extending transmission distance of ADSL signal |
Also Published As
Publication number | Publication date |
---|---|
CN100539625C (zh) | 2009-09-09 |
EP1350382A2 (de) | 2003-10-08 |
AU2002217828A1 (en) | 2002-07-08 |
US20020080933A1 (en) | 2002-06-27 |
WO2002052805A3 (en) | 2002-08-29 |
DE60123834T2 (de) | 2007-05-31 |
CN1489860A (zh) | 2004-04-14 |
WO2002052805A2 (en) | 2002-07-04 |
EP1350382B1 (de) | 2006-10-11 |
ATE342630T1 (de) | 2006-11-15 |
CA2432935C (en) | 2006-04-11 |
CA2432935A1 (en) | 2002-07-04 |
DE60123834D1 (de) | 2006-11-23 |
HK1058117A1 (en) | 2004-04-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6522730B1 (en) | DSL communication system with improved bandwidth | |
US6154524A (en) | Method and apparatus for automatically and adaptively adjusting telephone audio quality and DSL data rate in a DSL system | |
US6295343B1 (en) | Method and apparatus for combining voice line card and xDSL line card functions | |
US20020105964A1 (en) | Long subscriber loops using automatic gain control | |
US6549568B1 (en) | Method and apparatus for automatically adjusting the transmit power of data communication equipment operating in a multipoint environment | |
US6269154B1 (en) | Splitterless modem with integrated off-hook detector | |
CA2163570A1 (en) | Method and apparatus for detecting a telephone cpe alerting signal | |
US7352803B2 (en) | Apparatus and method for communicating voice and data between a customer premises and a central office | |
US6456650B1 (en) | Splitterless modem using harmonics reduction | |
US6690768B2 (en) | Power cutback configuration of digital subscriber line transceivers using public switched telephone network signaling | |
KR100921163B1 (ko) | 비차폐 연선 신호들을 위한 증폭기 | |
US6647024B1 (en) | System and method for an all digital communication system with a life line | |
US6782096B1 (en) | Subscriber line driver and termination | |
JP3415434B2 (ja) | Adsl通信システム | |
US6795548B2 (en) | Method and system for data communication | |
US6330235B1 (en) | Method and apparatus providing data communication over an existing telephone network without interfering with normal telephony functions | |
US7843858B2 (en) | Crosstalk masking for digital subscriber loops | |
KR20010018110A (ko) | 랜 데이터 전송장치 | |
JP2002515696A (ja) | Adsl接続を確保するための方法および装置 | |
JP2003199129A (ja) | 縒り線対において音声帯域信号とxdsl信号とを結合するラインインタフェース | |
US6687370B1 (en) | Method and an arrangement for securing an ADSL connection | |
KR200328611Y1 (ko) | 디지털 가입자 라인용 필터링 회로 | |
KR20020033731A (ko) | 전자기적 결합 신호를 사용하여 송수신기들 간에 메시지를전송하기 위한 시스템 및 방법 | |
KR20040019676A (ko) | 무선가입자망 단말기의 일반전화기 톤 소거 장치 및 그 방법 | |
WO2002030001A2 (en) | Filter and method therefor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: INTEL CORPROATION, CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HANSEN, CARL CHRISTIAN;REEL/FRAME:011398/0363 Effective date: 20001221 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20160210 |